Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY - Summary of Changes in Shareholders' Equity (Details)

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STOCKHOLDERS' EQUITY - Summary of Changes in Shareholders' Equity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning balance (in shares)     40,330,741    
Beginning balance     $ 1,576,825 $ 1,421,495  
Adoption of ASU 2014-09 [1]         $ (583)
Net earnings $ 53,838 $ 41,580 97,712 65,152  
Exercise/vesting of stock-based awards     0 0  
Stock-based compensation expense     $ 8,986 5,792  
Ending balance (in shares) 40,649,453   40,649,453    
Ending balance $ 1,682,940 $ 1,492,439 $ 1,682,940 $ 1,492,439  
Common Stock [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning balance (in shares)     40,331,000 40,031,000  
Beginning balance     $ 403 $ 400  
Exercise/vesting of stock-based awards (in shares)     318,000 289,000  
Exercise/vesting of stock-based awards     $ 3 $ 3  
Ending balance (in shares) 40,649,000 40,320,000 40,649,000 40,320,000  
Ending balance $ 406 $ 403 $ 406 $ 403  
Additional Paid-in Capital [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning balance     584,578 572,506  
Exercise/vesting of stock-based awards     (3) (3)  
Stock-based compensation expense     8,986 5,792  
Ending balance 593,561 578,295 593,561 578,295  
Retained Earnings [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning balance     991,844 848,589  
Adoption of ASU 2014-09 [1]         $ (583)
Net earnings     97,712 65,152  
Ending balance $ 1,088,973 $ 913,741 $ 1,088,973 $ 913,741  
[1] Refer to Note 1 for additional information related to the adoption of ASU 2014-09.